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Port 1628 (lontalk-norm)

IANA assigns port 1628 to lontalk-norm: LonTalk normal.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lontalk-norm TCP LonTalk normal - -
lontalk-norm UDP LonTalk normal - -

Check what is listening on port 1628

Linux: is anything listening on TCP 1628?
sudo ss -tlnp 'sport = :1628'
Linux: UDP 1628
sudo ss -ulnp 'sport = :1628'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1628
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1628 '
Windows (Command Prompt)
netstat -ano | findstr :1628
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1628 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1628
From Windows
Test-NetConnection HOST -Port 1628
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1628

Block port 1628 in the firewall

ufw
sudo ufw deny 1628/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1628 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1628 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1628' -Direction Inbound -Protocol TCP -LocalPort 1628 -Action Block
ufw
sudo ufw deny 1628/udp
iptables
sudo iptables -A INPUT -p udp --dport 1628 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1628 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1628' -Direction Inbound -Protocol UDP -LocalPort 1628 -Action Block

Related ports

1626shockwave1627t128-gateway1629lontalk-urgnt1630oraclenet8cman

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.